body {
    background-image: url(bg.png);
    font: 12px '微软雅黑', arial;
    color: #fff;
    font-size: 30px;
    -webkit-user-select: none;
}

header {
    display: block;
    margin: 0 auto;
    width: 500px;
    text-align: center;
}

header h1 {
    z-index: 4;
    font-size: 45px;
    color: yellow;
    font-weight: 800;
    text-shadow: 2px 2px 3px rgba(0, 0, 0, 0.3);
}

#time {
    z-index: 4;
    font-size: 18px;
    color: red;
    font-weight: 800;
    text-shadow: 2px 2px 3px rgba(0, 0, 0, 0.3);
}

#score {
    color: coral;
}

table {
    margin-top: 20px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.85;
}

tr{
    background-color: #fff;
}

td {
    width: 141px;
    height: 149px;
}
